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Issue 4, 2017
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Rh–Ag–Si ternary composites: highly active hydrogen evolution electrocatalysts over Pt–Ag–Si

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Abstract

Hydrogen production with the aid of electrocatalysis is a critical component for several developing clean-energy technologies. Such a renewable energy depends heavily on the choice of cheap and efficient catalysts for hydrogen evolution, which has still been a challenge until now. In this work, the theoretical calculation indicates that Rh–Ag–Si ternary catalysts exhibit more active hydrogen evolution performance than Pt–Ag–Si because the migration activation energies of H atoms from Rh(111) to Si are lower than those from Pt(111) to Si via the Ag surface. This simulation was confirmed by the experimental results: Rh–Ag/SiNW (or Pt–Ag/SiNW) catalysts were prepared by directly reducing Rh (or Pt) and Ag ions with Si–H bonds. The Rh–Ag/SiNW-2 with the optimal mass ratio of 2.3 : 23.4 : 74.3 (Rh : Ag : Si) exhibited a lower Tafel slope (51 mV dec−1) and a larger exchange current density (87.1 × 10−6 A cm−2) than the Pt–Ag/SiNW. In addition, the mass activity of Rh–Ag/SiNW-2 at an overpotential of 0.2 V (11.5 mA μgRh−1) is 12.0, 5.0 and 3.3 fold higher than that of Rh–Ag (0.96 mA μgRh−1), Pt–Ag/SiNW (2.3 mA μgPt−1) and 40 wt% Pt/C (3.5 mA μgPt−1) catalysts, respectively. Moreover, the Rh–Ag/SiNW nanocatalysts had good stability in acidic media. The results presented herein may offer a novel and effective methodology for the designing of cost-efficient and environmentally friendly catalysts for electrochemical fields.

Graphical abstract: Rh–Ag–Si ternary composites: highly active hydrogen evolution electrocatalysts over Pt–Ag–Si

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Publication details

The article was received on 07 Nov 2016, accepted on 11 Dec 2016 and first published on 04 Jan 2017


Article type: Paper
DOI: 10.1039/C6TA09619K
Citation: J. Mater. Chem. A, 2017,5, 1623-1628
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    Rh–Ag–Si ternary composites: highly active hydrogen evolution electrocatalysts over Pt–Ag–Si

    B. Jiang, Y. Sun, F. Liao, W. Shen, H. Lin, H. Wang and M. Shao, J. Mater. Chem. A, 2017, 5, 1623
    DOI: 10.1039/C6TA09619K

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